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1.
Enkhtsetseg Dashjav Guido Kreiner Walter Schnelle Frank R. Wagner Rüdiger Kniep 《无机化学与普通化学杂志》2004,630(5):689-696
Carbometalates: Complex Anions equation/tex2gif-stack-4.gif [MoC4/26—] in the Crystal Structure of Pr equation/tex2gif-stack-5.gif [MoIIC2] Criteria for the existence of carbometalates are established and discussed in a broader context. The concept is then applied to the novel compound Pr2[MoC2], which is characterized by chemical analyses, X‐ray diffraction and metallography. The crystal structure (tetragonal, P42/mnm, Z = 4, a = 581.29(8) pm, c = 1032.53(14) pm) consists of layered polyanions equation/tex2gif-stack-6.gif[MoC4/26—] of distorted vertex and edge sharing MoC4 tetrahedra. Praseodymium is also in a distorted tetrahedral coordination by carbon. The physical properties show “bad metal” behaviour and localized magnetic 4f‐moments in agreement with the existence of Pr3+‐species. A detailed bonding analysis using both the electron localization function ELF and the COHP method justifies the interpretation of the title compound as a carbomolybdate(II). 相似文献
2.
D. Hojman M. A. Cardona D. Bazzacco N. Blasi J. Davidson M. Davidson M. E. Debray A. J. Kreiner S. M. Lenzi G. Lo Bianco D. R. Napoli C. Rossi Alvarez 《The European Physical Journal A - Hadrons and Nuclei》2004,21(3):383-390
High-spin states in 163,164Ho were investigated by means of in-beam
-ray spectroscopy techniques using the multidetector array GASP. Excited states in 163,164Ho were populated predominantly through the incomplete-fusion mechanism in the 160Gd (11B
reaction at a beam energy of 61 MeV. Known rotational bands in 163
Ho have been extended to higher spins and a three-quasiparticle band has been observed in this nucleus. Rotational bands have been identified in 164Ho and their configurations have been discussed. Empirical Gallagher-Moszkowski (GM) splitting energies were extracted from the
and
GM doublets. Alignments, band crossing frequencies, and electromagnetic properties have been analyzed in the framework of the cranking model.Received: 13 February 2004, Revised: 18 March 2004, Published online: 14 September 2004PACS:
21.10.Re Collective levels - 21.60.Ev Collective models - 23.20.Lv
transitions and level energies - 27.70. + q
相似文献
3.
4.
G. Lo Bianco Ch. Protochristov G. Falconi N. Blasi D. Bazzacco G. de Angelis D. R. Napoli M. A. Cardona A. J. Kreiner H. Somacal 《Zeitschrift für Physik A Hadrons and Nuclei》1997,359(4):347-348
High-spin states in 124Xe were populated by means of the 110Pd(18O,4n) reaction. In-beam γ rays were measured using the GASP spectrometer. A dipole band, similar to those previously found in other nuclei of this mass region, was identified in 124Xe. 相似文献
5.
6.
Robin S. McDowell Melvin I. Buchwald Michael S. Sorem Alan G. Robiette Catherine M. Deeley Welf A. Kreiner 《Journal of Molecular Spectroscopy》1985,112(2):363-376
A Fourier transform infrared spectrum of 91% 13CD4 has been recorded between 885 and 1193 cm?1 with a resolution of 0.04 cm?1. The frequencies of 600 lines were measured with an accuracy of ±0.003 cm?1. Of these, approximately 368 are assigned as allowed transitions in ν4, 95 are forbidden ν4 transitions, and 137 belong to ν2; maximum upper state J values are 20 for ν4 and 19 for ν2. The ground state tensor constants Dt, H4t, and H6t were obtained by fitting them to four rotational transitions observed by Kreiner and Opferkuch in the infrared-microwave double-resonance spectrum. An interacting-band analysis of the diad then yields 22 spectroscopic constants for these Coriolis-coupled fundamentals and fits the experimental frequencies with an rms deviation of 0.0055 cm?1 for 432 unblended lines that were assigned unit weight. A ν4P+(12) transition at 943.3812 cm?1, nearly coincident with the 10P(22) emission of the 12C16O2 laser, has been investigated by heterodyne spectroscopy and its detuning (?64 MHz) and absorption coefficient have been determined. Such coincidences may lead to the development of laser analytical techniques for 13CD4, which is a useful nonradioactive atmospheric tracer. 13CD4 transitions that are within 300 MHz of isotopic CO2 laser lines are tabulated for this purpose and for use in double-resonance experiments. 相似文献
7.
W.A. Kreiner R. Opferkuch A.G. Robiette P.H. Turner 《Journal of Molecular Spectroscopy》1981,85(2):442-448
The ground-state rotational constants B0, D0, and H0 have been determined for GeH4 from the analysis of ground-state combination differences in the infrared spectra of isotopically enriched 70GeH4, 72GeH4, and 74GeH4. The spectra were recorded at 0.06-cm?1 resolution and about 0.005-cm?1 precision for unblended lines. Suitable combination differences were found in both the ν2 and the ν4 infrared bands. The ground-state constants were assumed to be invariant to isotopic substitution at Ge, and the tensor distortion constants were held fixed at their microwave values. The results obtained are: B0 = 2.69587 ± 0.00007 cm?1, D0 = (3.34 ± 0.03) × 10?5 cm?1, H0 = (1.3 ± 0.5) × 10?9 cm?1. 相似文献
8.
The binary alloy phase ϵ‐Ag7+xMg26–x with x ≈ 1 and small amounts of the β′‐AgMg phase crystallize by annealing of Ag–Mg alloys with starting compositions between 24–28 At‐% Ag at 390 to 420 °C. A model structure for the ϵ‐phase consisting of a fcc packing of Mackay clusters was derived from the known structure of the ϵ′‐Ag17Mg54 phase. Crystals of the ϵ‐phase were obtained by direct melting of the elements and annealing. The examination of a single crystal yielded a face‐centered cubic unit cell, space group Fm3 with a = 1761.2(5) pm. The refinement was started with the parameters of the model: wR2(all) = 0.0925 for 1093 symmetrically independent reflections. A refinement of the occupancy parameters indicated a partial replacement of silver for magnesium at two metal atom sites, resulting in the final composition ϵ‐Ag7+xMg26–x with x = 0.96(2). There are 264 atoms in the unit cell and the calculated density is 3.568 gcm–3. The topology of the model was confirmed. Mackay icosahedra are located at the lattice points of a face‐centered cubic lattice. Differences between model and refined structure and their effects on the powder patterns are discussed. The new binary structure type of ϵ‐Ag7+xMg26–x can be described in terms of the I3‐cluster concept. 相似文献
9.
M.A.J. Mariscotti A.J. Kreiner M. Behar A.O. Macchiavelli G.García Bermúdez A.M.J. Ferrero C. Baktash P. Thieberger 《Nuclear Physics A》1984,422(1):167-188
High-spin states of 100Rh have been populated with the reactions 99Ru(α, 2np) and 98Mo(6Li, 4n) and their γ-decay has been studied with Ge(Li) detectors in singles and coincidence. Angular and time distributions of the γ-rays were also measured. As a result 14 new levels spanning spins up to I = 16 built on the 5+, 4.5 min isomer at 107 keV have been established, and a half-life of nsec has been determined for the 7+ state at 111.9 keV. The rotor-plus-two-quasiparticle model has been used to describe the observed level structure. The pn interaction is shown to be of negligible effect. On the other hand, the introduction of a soft core is essential. The application of the VMI model with the parameters extracted from the 98Ru core yields a remarkably good agreement. This is the first time that the anomalous VMI root has been applied to a doubly odd nucleus. 相似文献
10.
Hans-Dietrich Stachel Bruno Wiesend Christine Kreiner 《Journal of heterocyclic chemistry》1985,22(5):1413-1418
The epimeric bromoghydrins 13/14 as well as their ethers 5/6 rearrange in the presence of silver ions to the 5-hydroxypyridones 15 or their ketals 9 respectively. with the bromohydrin ethers 5/6a and b this transformation is effected also with sodium methoxide. Under these reaction conditions the ring expansion is presumend ot proceed via bicyclic aziridines of which 7 could be issolated, The N-methylated compounds 5c/6c which cannot react likewise, form with sodium methoxide the 6-methoxypyridone 12 . 相似文献